// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Microsoft.Extensions.Primitives;
 
public class TestFileChangeToken : IChangeToken
{
    public TestFileChangeToken(string filter = "")
    {
        Filter = filter;
    }
 
    public bool ActiveChangeCallbacks => false;
 
    public bool HasChanged { get; set; }
 
    public string Filter { get; }
 
    public IDisposable RegisterChangeCallback(Action<object> callback, object state)
    {
        return new NullDisposable();
    }
 
    private sealed class NullDisposable : IDisposable
    {
        public void Dispose()
        {
        }
    }
 
    public override string ToString() => Filter;
}